Recent content by MitYeltu

No, there is not a different methods for NPN. That's why I'm asking. I suspect it is merely a matter of reversing things - keep the emitter, collector and base where they are in the circuits, but simply reverse the polarity on the sources. However, as I said, I'm not positive on this and I...

I just want to check my sanity... I am going to be testing some transistors in a lab very soon per the above mil std. The test methods range from Vce, Vbe, hfe and the breakdown voltages that are listed on the datasheet. The transistor at this point is irrelevant. Here's what I need to...

No, I know whuch one was removed, I just have no idea why THAT row was removed. If I had a matrix that was not in my textbook, how am I to know which row is to be removed if, indeed, any row CAN be removed? I don't understand how I would know WHEN I can apply this method. I also don't...

Preface: I am an electrical engineer studying for the PE exam. I am reviewing power system analysis and have come across something I do not remember in any of my classes. I'll not bore you with the entire problem. Suffice it to say there is a 4x4 matrix that is being partitioned as follows...

NEC 408.3.E reads as follows The phase arrangement on 3-phase buses shall be A, B, C from front to back, top to bottom, or left to right, as viewed from the front of the switchboard or panelboard. The B phase shall be that phase having the higher voltage to ground on 3-phase, 4-wire...

I have a question about a confusing section of the NESC (not that many sections are not confusing, but this is my current issue). Section 220.B.2.b reads as follows That the supply circuits be placed on the end and adjacent pins of the lowest through signal support arm and that a 750 mm (30...

That makes sense. I hadn't thought about that, but I agree now that I have. Now, don't be angry for my asking it this way, but, is that the NESC reason for not attaching it to both? I have not seen that specified anywhere.

I am working on putting a new battery rack into a substation. I was re-reading the NESC and came across section 143. This section suggests it is not recommended to anchor my rack to both the floor and the wall. Can anyone explain why this is not recommended?